hydrogen peroxide, H 2 O 2 or H–O–O–H.
a compound containing the bivalent group –O 2 –, derived from hydrogen peroxide, as sodium peroxide, Na 2 O 2 , or dimethyl peroxide, C 3 H 6 O 2 .
the oxide of an element that contains an unusually large amount of oxygen.
verb (used with object), peroxided, peroxiding.
to use peroxide as a bleaching agent on (especially the hair).

1795–1805; per- + oxide

peroxidic [pur-ok-sid-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peroxide (pəˈrɒksaɪd)
1.  short for hydrogen peroxide, esp when used for bleaching hair
2.  any of a class of metallic oxides, such as sodium peroxide, Na2O2, that contain the divalent ion --O-O--
3.  (not in technical usage) any of certain dioxides, such as manganese peroxide, MnO2, that resemble peroxides in their formula but do not contain the --O-O-- ion
4.  any of a class of organic compounds whose molecules contain two oxygen atoms bound together. They tend to be explosive
5.  (modifier) of, relating to, bleached with, or resembling peroxide
6.  (tr) to bleach (the hair) with peroxide

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1804, formed in Eng. from per- "large amount" + oxide (q.v.). Peroxide blonde is attested from 1918.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

peroxide per·ox·ide (pə-rŏk'sīd')

  1. A compound, such as sodium peroxide, that contains a peroxy group and yields hydrogen peroxide when treated with an acid.

  2. Hydrogen peroxide.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
peroxide   (pə-rŏk'sīd')  Pronunciation Key 
  1. A compound containing the group O2. Peroxides are strong oxidizers and are used as industrial bleaches. When any peroxide is combined with an acid, one of the products is hydrogen peroxide.

  2. Hydrogen peroxide.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Skip using hydrogen peroxide on the countertops, and add it to your laundry as
  a bleach alternative.
If you plan to clean with hydrogen peroxide, be sure to wear gloves when
  handling it.
Two other models, built for demo use only, run on hydrogen peroxide.
Use vinegar, hydrogen peroxide, or bleach solutions for best results.
Image for peroxide
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